JP2012077766A - Soundproof joint pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a soundproof joint pipe which can enhance soundproof performance and for which joining work can be smoothly performed.SOLUTION: A soundproof joint pipe 11 includes a joint pipe body 12 and a soundproof layer 13 provided to the outer circumference thereof. The joint pipe body 12 has a bent pipe part 12a and connecting part 12b. The soundproof layer 13 includes an inner circumferential sound insulation layer 14, a sound absorbing layer 15, and an outer circumferential sound insulation layer 16. The sound absorbing layer 15 includes an inner circumferential sound absorbing layer 15a provided only to the bent pipe part 12a and an outer circumferential sound absorbing layer 15b provided from the bent pipe part 12a to the connecting part 12b. Owing to the allocation of the inner circumferential sound absorbing layer 15a and the outer circumferential sound absorbing layer 15b, the thickness of the sound absorbing layer 15 located to the connecting part 12b is smaller than the thickness of the sound absorbing layer 15 located to the bent pipe part 12a.

Description

  The present invention relates to a soundproof joint pipe provided with a soundproof layer on the outer periphery of a joint pipe main body.

  Conventionally, a soundproof tube having a sound absorbing layer and a sound insulating layer arranged in order from the outer periphery of the tube is known. In this soundproof tube, the soundproof structure in which the sound absorption layer and the sound insulation layer are laminated provides a soundproof effect that suppresses leakage of sound generated by the fluid flowing through the tube (see, for example, Patent Document 1). ).

JP 2006-308071 A

  By the way, in the soundproof joint pipe having the curved pipe portion, the flow direction of the fluid through the inside changes, so that noise is likely to be generated at the site of the soundproof joint pipe in the pipe structure. Increasing the thickness of the sound absorbing material is effective for enhancing the soundproofing effect at the site of the soundproofing joint pipe. However, as the thickness of the sound absorbing material is increased, the outer diameter of the soundproof joint pipe is increased. Thereby, the level | step difference of the outer peripheral surface of the soundproof pipe connected with a soundproof joint pipe and the outer peripheral surface of a soundproof joint pipe becomes large. When such a level difference occurs, for example, other members may be easily caught on the level difference during pipe construction, or may be difficult to wind when the joint tape is wound around the level difference. As described above, in the soundproof joint pipe, the connection work may be complicated by enhancing the soundproofing effect.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a soundproof joint pipe capable of enhancing soundproof performance and smoothly performing a connecting operation.

  In order to achieve the above object, a soundproof joint pipe according to claim 1 is composed of a joint pipe body having a curved pipe section and a connection section, a sound absorbing layer, and a sound insulation layer, and the joint pipe body. A soundproof joint pipe provided with a soundproof layer disposed on the outer periphery of the sound pipe, wherein the thickness of the sound absorbing layer located in the connecting portion is configured to be thinner than the sound absorbing layer located in the curved pipe portion. To do.

  The present invention is based on the hypothesis that noise is less likely to be generated compared to a curved pipe part because the connecting part of the joint pipe body is linear, and the connecting part is less than the thickness of the sound absorbing layer located in the curved pipe part. It was made by finding that the soundproofing performance is maintained even if the thickness of the sound absorbing layer is reduced. In this invention, the thickness of the sound absorbing layer located at the connecting portion is configured to be thinner than the sound absorbing layer located at the bent tube portion. That is, it is possible to increase the soundproof performance of the soundproof joint pipe by thickening the sound absorbing layer located in the curved pipe portion, and to reduce the outer diameter including the soundproof layer at the connecting portion.

The gist of the invention described in claim 2 is that, in the soundproof joint pipe according to claim 1, the sound absorbing layer located in the curved pipe portion has a structure in which a plurality of sound absorbing materials are laminated.
According to this structure, it becomes easy to adjust the thickness of the sound absorption layer located in the curved pipe part and the thickness of the sound absorption layer located in the connection part as described above.

The gist of the invention described in claim 3 is that, in the soundproof joint pipe according to claim 1 or 2, the soundproof layer is formed by sandwiching the sound absorbing layer between the sound insulating layers.
According to this configuration, the soundproof performance of the soundproof joint pipe can be improved.

  ADVANTAGE OF THE INVENTION According to this invention, while improving soundproof performance, the soundproof joint pipe which can perform a connection operation | work smoothly is provided.

Sectional drawing which shows the state which connected the soundproof joint pipe | tube in embodiment to the soundproof straight pipe. Schematic which shows the measurement environment of a noise level.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, embodiments of the invention will be described in detail with reference to the drawings.
As shown in FIG. 1, the soundproof joint pipe 11 includes a joint pipe main body 12 and a soundproof layer 13 disposed on the outer periphery thereof.

  The joint pipe main body 12 has a curved pipe part 12a and a connecting part 12b, and the connecting part 12b is configured such that the soundproof straight pipe 31 is connected. The joint pipe body 12 is formed of various hard materials and soft materials, and has a cylindrical shape through which fluid flows. It does not specifically limit as a material which forms the joint pipe main body 12, For example, resin materials, such as a polyvinyl chloride and polyethylene, are mentioned. A specific example of the joint pipe body 12 is described in, for example, JIS K 6739 (2007). The joint pipe body 12 of the present embodiment is a “90 ° large bend elbow (LL)”.

  The curved pipe portion 12a is a portion that bends at, for example, an angle of 45 ° or 90 ° (in this embodiment, an angle of 90 °). Connecting portions 12b are provided at both ends of the bent tube portion 12a. The outer diameters of these connecting portions 12b are formed larger than the outer diameter of the curved pipe portion 12a, and have an inner diameter into which the straight pipe main body 32 constituting the soundproof straight pipe 31 is inserted. The straight pipe main body 32 is inserted and bonded to the connecting portion 12b, whereby a continuous pipe in the order of the straight pipe main body 32, the joint pipe main body 12, and the straight pipe main body 32 is configured.

The soundproof layer 13 includes an inner peripheral sound insulating layer 14, a sound absorbing layer 15, and an outer peripheral sound insulating layer 16, and is arranged from the outer peripheral surface of the joint pipe body 12 in this order.
The soundproof layer 13 of the present embodiment has a configuration in which the sound absorbing layer 15 is sandwiched between the inner peripheral sound insulating layer 14 and the outer peripheral sound insulating layer 16. With this configuration, for example, it is easier to enhance the soundproofing effect than the soundproofing layer 13 including the outer peripheral sound insulating layer 16 and the sound absorbing layer 15.

The inner sound insulation layer 14 and the outer sound insulation layer 16 preferably have a specific gravity of, for example, 1.5 or more, from the viewpoint of improving sound insulation performance. The total surface density of the inner and outer sound insulation layers 14 and 16 is preferably in the range of 1.5 to 25 kg / m ² . When the total surface density is 1.5 kg / m ² or more, an excellent soundproofing effect is easily obtained. On the other hand, when the total surface density is 25 kg / m ² or less, it is easy to ensure workability when the inner peripheral sound insulating layer 14 and the outer peripheral sound insulating layer 16 are attached to the joint pipe body 12.

  As the sound insulating material constituting the inner peripheral sound insulating layer 14 and the outer peripheral sound insulating layer 16, a material in which a filler is contained in a polymer material is suitable. Examples of the polymer material include at least one selected from synthetic resins, elastomers, and rubbers. Examples of synthetic resins include olefin resins, acrylic resins, styrene resins, and the like. Examples of the elastomer include an olefin elastomer and a urethane elastomer. Examples of the rubber include acrylonitrile-butadiene rubber (NBR), styrene-butadiene rubber (SBR), and butyl rubber. Among the polymer materials, it is preferable to include at least an elastomer or rubber from the viewpoint that it is easy to be deformed into a shape along the outer periphery of the joint pipe body 12 by imparting flexibility to the sound insulating material. . Examples of the filler include barium sulfate, calcium carbonate, talc, magnesium oxide, alumina, titanium oxide, barite, iron powder, zinc oxide, and graphite. The sound insulating material can contain additives such as a plasticizer, an antioxidant, and an adhesive as necessary.

  The sound absorbing layer 15 includes an inner peripheral sound absorbing layer 15a provided only on the curved pipe portion 12a and an outer peripheral sound absorbing layer 15b provided from the curved pipe portion 12a to the connecting portion 12b. That is, the sound absorbing layer 15 located in the curved pipe portion 12a has a configuration in which an inner peripheral sound absorbing layer 15a and an outer peripheral sound absorbing layer 15b are stacked, and the sound absorbing layer 15 located in the connecting portion 12b is configured only from the outer peripheral sound absorbing layer 15b. Has been. Due to the arrangement of the inner peripheral sound absorbing layer 15a and the outer peripheral sound absorbing layer 15b, the sound absorbing layer 15 located in the connecting portion 12b is configured to be thinner than the sound absorbing layer 15 located in the curved pipe portion 12a.

  The thickness of the sound absorbing layer 15 located in the connecting portion 12b and the sound absorbing layer 15 located in the bent tube portion 12a are appropriately set according to the desired soundproof performance. The thickness of the sound absorbing layer 15 located in the connecting portion 12b is about 20 to 60%, where 100 is the thickness of the sound absorbing layer 15 located in the bent tube portion 12a. The thickness of the sound absorbing layer 15 located in the curved pipe portion 12a is set in a range of 5 to 30 mm, for example. Moreover, the thickness of the soundproof layer 13 located in the connecting portion 12b is about 30 to 70%, where 100 is the thickness of the soundproof layer 13 located in the bent tube portion 12a.

The inner peripheral sound absorbing layer 15 a and the outer peripheral sound absorbing layer 15 b can be formed by winding a sound absorbing material having a predetermined thickness around the outer periphery of the joint pipe body 12.
The sound absorbing material forming the sound absorbing layer 15 is composed of an open cell body. Examples of the open cell body include a foamed resin material, a fiber-based material, and a composite material thereof. Examples of the foamed resin material include urethane foam and polyolefin foam. Examples of the fiber material include various nonwoven fabrics, glass wool, rock wool, and the like. The sound absorbing material is preferably formed from a foamed resin material from the viewpoint of easy processing. The expansion ratio of the foamed resin material is preferably 10 to 50 times from the viewpoint of enhancing sound absorption performance and shape stability. The specific gravity of the sound absorbing material is preferably in the range of 0.01 to 0.5, for example, and more preferably in the range of 0.02 to 0.3.

  The sound insulating material and the sound absorbing material can be held on the outer periphery of the joint pipe body 12 by known holding means such as an adhesive, a pressure sensitive adhesive, a pressure sensitive adhesive tape, and a shrink film. In the soundproof joint pipe 11 of the present embodiment, a shrink film is provided on the outer periphery of the soundproof layer 13.

  The soundproof joint pipe 11 of this embodiment is manufactured as follows. First, after the sound insulating material is wound around the joint pipe main body 12, the inner peripheral sound insulating layer 14 is formed by temporarily fixing with a pressure-sensitive adhesive tape. Next, a sound absorbing material for forming the inner peripheral sound absorbing layer 15a is wound. And the laminated body which laminated | stacked the outer periphery sound absorption layer 15b and the outer periphery sound insulation layer 16 previously is prepared, and the inner periphery sound absorption layer 15a is clamped between the inner periphery sound insulation layers 14 by winding the laminated body. . The laminate is formed by adhering or adhering a sound absorbing material and a sound insulating material. Then, after temporarily fixing a laminated body with an adhesive tape, the outer periphery is coat | covered with a tubular shrink film. Next, the shrink film is contracted by heating to a predetermined temperature, and each layer is held in the joint pipe body 12.

In addition, the manufacturing method of the soundproof joint pipe | tube 11 is not limited to the method mentioned above, A sound-insulating material and a sound-absorbing material may be wound separately, respectively, and you may hold | maintain by a holding means sequentially.
Next, the soundproof straight pipe 31 connected to the soundproof joint pipe 11 and the piping structure will be described.

  The soundproof straight pipe 31 includes a straight pipe main body 32 and a soundproof layer 33 disposed on the outer periphery thereof. The soundproof layer 33 includes a sound absorbing layer 34 and a sound insulating layer 35. The straight pipe main body 32 includes a main body portion 32a where the soundproof layer 33 is disposed and an insertion portion 32b inserted into the connecting portion 12b. The insertion portion 32b is configured such that the outer surface is exposed without the soundproof layer 33 being disposed. The insertion portion 32b is inserted into the connecting portion 12b and bonded with an adhesive, whereby the soundproof straight pipe 31 is connected to the connecting portion 12b. The material for forming the straight pipe main body 32 is the same as that for the joint pipe main body 12 described above. A specific example of the straight pipe main body 32 is described in, for example, JIS K 6741 (2007). As the material of the sound absorbing material constituting the sound absorbing layer 34 and the sound insulating material constituting the sound insulating layer 35, the same materials as those of the sound absorbing material and the sound insulating material can be used.

  In such a soundproof straight pipe 31, the flow is less turbulent than the curved pipe part 12a of the soundproof joint pipe 11, and therefore noise is less likely to occur than the curved pipe part 12a. Therefore, the soundproof layer 33 of the soundproof straight pipe 31 can be made thinner than the soundproof layer 13 disposed in the curved pipe portion 12a. The thickness of the soundproof layer 33 of the soundproof straight pipe 31 is about 30 to 70%, where 100 is the thickness of the soundproof layer 13 disposed in the curved pipe portion 12a.

  Here, in the soundproof joint pipe 11, when the thickness of the whole soundproof material of the soundproof joint pipe 11 is set in accordance with the soundproof performance required for the curved pipe part 12a, the outer diameter including the soundproof layer of the connecting part 12b is The outer diameter of the main body 32a including the soundproof layer is excessively large. That is, in the piping structure, the step between the outer peripheral surface of the soundproof straight pipe 31 and the outer peripheral surface of the soundproof joint pipe 11 becomes large. In this regard, the present inventors have proposed that the sound absorbing part located in the curved pipe portion 12a under the hypothesis that noise is less likely to occur compared to the curved pipe portion 12a because the connecting portion 12b of the joint pipe body 12 is linear. It has been found that the soundproofing performance is maintained even if the thickness of the sound absorbing layer of the connecting portion 12b is made thinner than the thickness of the layer 15. From such knowledge, in the soundproof joint pipe 11 of this embodiment, the thickness of the sound absorbing layer 15 located at the connecting portion 12b is configured to be thinner than the sound absorbing layer 15 located at the curved pipe portion 12a. That is, by increasing the thickness of the sound absorbing layer 15 located in the curved pipe portion 12a, the soundproofing performance of the soundproof joint tube 11 can be improved, and the outer diameter including the soundproof layer 13 can be reduced in the connecting portion 12b.

  Such a soundproof joint pipe 11 and a piping structure using the same are applied to transport of fluid such as liquid and gas, for example. Here, in the drainage pipe for transporting the wastewater of the house, there is a risk that the quietness of the house is significantly hindered by the sound accompanying the drainage. In this respect, the soundproof joint pipe 11 of the present embodiment and the piping structure using the same can be suitably used for a house that suppresses sound leakage due to the drainage of the house.

The effects exhibited by this embodiment will be described below.
(1) In the soundproof joint pipe 11 of this embodiment, the thickness of the sound absorbing layer 15 located at the connecting portion 12b is configured to be thinner than the sound absorbing layer 15 located at the curved pipe portion 12a. Thereby, the level | step difference of the outer peripheral surface of the soundproofing straight pipe 31 and the outer peripheral surface of the soundproofing joint pipe | tube 11 can be made small. For this reason, it becomes easy to avoid that another member gets caught in a level | step difference at the time of piping construction, for example. In addition, since the step is small, the work of winding the joint tape T around the boundary portion between the soundproof layer 33 of the soundproof straight pipe 31 and the soundproof layer 13 of the soundproof joint pipe 11 becomes easy. On the other hand, in the curved pipe portion 12a, the soundproofing effect can be enhanced by providing the sound absorbing layer 15 having a predetermined thickness. Therefore, the soundproof joint pipe 11 is provided which can enhance the soundproof performance and can smoothly perform the connecting work.

  (2) The sound absorbing layer 15 located in the curved pipe portion 12a is composed of an inner peripheral sound absorbing layer 15a and an outer peripheral sound absorbing layer 15b. For this reason, it is easy to set the thickness of the sound absorbing layer 15 located in the curved pipe portion 12a and the thickness of the sound absorbing layer 15 located in the connecting portion 12b as described above.

  (3) The sound insulation layer 13 is configured such that the sound absorption layer 15 is sandwiched between the inner sound insulation layer 14 and the outer sound insulation layer 16. According to this configuration, it is easy to improve the soundproof performance. Therefore, it is possible to improve the soundproof performance while avoiding the sound absorbing layer 15 from becoming excessively thick.

In addition, the said embodiment can also be changed and comprised as follows.
The sound absorbing layer 15 located in the curved pipe portion 12a is composed of two layers, an inner peripheral sound absorbing layer 15a and an outer peripheral sound absorbing layer 15b, but may be composed of three or more layers. Further, the sound absorbing layer 15 located in the connecting portion 12b may be composed of a plurality of layers.

  The sound absorbing layer 15 can be composed of a single layer. That is, by using a sound absorbing material in which only a portion located at the connecting portion 12b is formed thin, the thickness of the sound absorbing layer 15 located at the connecting portion 12b is made thinner than the sound absorbing layer 15 located at the bent tube portion 12a. Also good.

The material (type of material, specific gravity, etc.) of the inner peripheral sound absorbing layer 15a and the outer peripheral sound absorbing layer 15b may be the same or different.
-At least one of the inner peripheral sound insulating layer 14 and the outer peripheral sound insulating layer 16 may be omitted. In this case, it is preferable to omit the inner peripheral sound insulating layer 14 from the viewpoint that it is easy to obtain a desired soundproofing performance.

The material (type of material, specific gravity, etc.) of the inner peripheral sound insulating layer 14 and the outer peripheral sound insulating layer 16 may be the same or different.
The structure of the soundproof layer 33 of the soundproof straight pipe 31 is not particularly limited, and may be composed of two layers, the sound absorbing layer 34 and the sound insulating layer 35, or the sound absorbing layer or the sound insulating layer may be composed of a plurality of layers. Good. For example, a three-layer structure in which a sound absorbing layer is sandwiched between sound insulating layers may be used.

Next, the technical idea that can be grasped from the above embodiment will be described below.
(B) A soundproof joint pipe whose outermost layer is made of a shrink film. According to this configuration, the soundproof layer can be held on the joint pipe body, and the appearance of the soundproof joint pipe is improved.

  (B) A pipe structure in which the soundproof joint pipe is connected to a soundproof straight pipe comprising a main pipe, a sound absorbing layer and a sound insulating layer, and a soundproof layer disposed on the outer periphery of the main pipe, wherein the soundproof straight pipe The thickness of the soundproof layer is a piping structure configured to be thinner than the thickness of the soundproof layer located at the curved pipe portion of the soundproof joint tube.

  (C) The piping structure in which the outermost layer of the soundproof straight pipe and the soundproof joint pipe is made of a shrink film. According to this structure, since the level | step difference of the outer peripheral surface of a soundproof straight pipe and the outer peripheral surface of a soundproof joint pipe becomes small, and it is covered with the shrink film, a good-looking piping structure can be provided.

Next, the embodiment will be specifically described with reference to examples and comparative examples.
In Example 1, a soundproof joint pipe in which the inner peripheral sound absorbing material was provided only on the curved pipe portion was produced. In Example 2, a soundproof joint tube was produced in the same manner as in Example 1 except that the inner peripheral sound insulating material was omitted. In Comparative Example 1, a soundproof joint pipe was produced in the same manner as in Example 1 except that the inner peripheral sound absorbing material was provided in the connecting portion. In Comparative Example 2, a soundproof joint pipe was produced in the same manner as in Example 2 except that the inner peripheral sound absorbing material was provided at the connecting portion. In Reference Example 1, a soundproof joint pipe was produced in the same manner as in Example 1 except that the inner peripheral sound absorbing material was not provided.

Table 1 shows the thickness of the sound insulating material and the sound absorbing material in each example. The noise level was measured using the soundproof joint pipe of each example. FIG. 2 shows an outline of the measurement environment.
In this measurement environment, piping is provided from the toilet 51 serving as a drainage source to the discharge unit 52. The pipe is configured by connecting a soundproof straight pipe 53 and a soundproof joint pipe 54. The piping is provided along the outside of the living space surrounded by the floor, walls, and ceiling.

  The noise in the living space when drainage is passed from the toilet 51 is collected by the microphone M, and the noise level is measured by a sound level meter (LA-5120, manufactured by Ono Sokki Co., Ltd.). The microphone M is installed such that the distance A from the floor is 1.3 m and the distance B from the wall is 1 m.

  As shown in Table 1, the noise level of the soundproof joint pipe of each example was measured by connecting to a soundproof straight pipe having the same soundproof layer. The noise level measurement results are also shown in Table 1.

表１に示されるように、実施例１の防音継手管は、比較例１の防音継手管と同等の騒音レベルであった。また、実施例２の防音継手管は、比較例２の防音継手管と同等の騒音レベルであった。この結果から、曲管部に位置する吸音層の厚みに対して、連結部の吸音層の厚みを薄くしても、防音性能は維持されることが分かる。

As shown in Table 1, the soundproof joint pipe of Example 1 had a noise level equivalent to that of the soundproof joint pipe of Comparative Example 1. The soundproof joint pipe of Example 2 had a noise level equivalent to that of the soundproof joint pipe of Comparative Example 2. From this result, it can be seen that the soundproofing performance is maintained even if the thickness of the sound absorbing layer of the connecting portion is made thinner than the thickness of the sound absorbing layer located in the curved pipe portion.

  Here, the thickness of the sound absorbing material in the connecting portion of Example 1 is thinner than the thickness of the sound absorbing material in the connecting portion of Comparative Example 1. That is, the thickness of the sound absorbing layer in the connecting portion of Example 1 is configured to be thinner than the thickness of the sound absorbing layer in the connecting portion of Comparative Example 1. That is, since the thickness of the sound absorbing layer in the connecting portion of Example 1 is closer to the thickness of the soundproof layer of the soundproof straight pipe as compared with Comparative Example 1, the step in Example 1 is smaller than that of Comparative Example 1. Similarly, in Example 2, the step is smaller than in Comparative Example 2. In Reference Example 1, it can be seen that the sound absorption performance is inferior to that of Comparative Example 1 because the thickness of the sound absorbing layer is smaller than that of Comparative Example 1.

  DESCRIPTION OF SYMBOLS 11 ... Soundproof joint pipe, 12 ... Joint pipe main body, 12a ... Curved pipe part, 12b ... Connection part, 13 ... Soundproof layer, 14 ... Inner circumference sound insulation layer, 15 ... Sound absorption layer, 15a ... Inner circumference sound absorption layer, 15b ... Outer circumference Sound absorbing layer, 16 ... outer peripheral sound insulating layer.

Claims (3)

A soundproof joint pipe comprising a bent pipe part, a joint pipe body having a connecting part, a sound absorbing layer and a sound insulation layer, and a soundproof layer disposed on the outer periphery of the joint pipe body,
The soundproof joint pipe is characterized in that the sound absorbing layer located at the connecting portion is thinner than the sound absorbing layer located at the curved pipe portion. The soundproof joint pipe according to claim 1, wherein the sound absorbing layer located in the curved pipe portion has a structure in which a plurality of sound absorbing materials are laminated. The soundproof joint pipe according to claim 1 or 2, wherein the soundproof layer includes the sound absorbing layer sandwiched between the sound insulating layers.

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